Attachment to stamping machines or the like for holding and feeding strips



F05). 13, 1945. w FE|| ER 2,369,551

ATTACHMENT T0 STZAMPING MACHINES OR THE LIKE FOR HOLDING AND FEEDING STRIPS Filed April 14, 1945 3 Sheets-Sheet 1 INVENTQR ham 5%,

ATTORNEY Feb. 13, 1945.

. W. FEILER ATTACHMENT TO STAMPING MACHINES OR THE LIKE FOR HOLDING AND FEEDING STRIPS Filed April 14, 1943 3 Sheets-Sheet 2 INVENTOR BY M 4: W

ATTORNEY- Feb. 13, 1945. w FElLER 2,369,551

. ATTACHMENT To STAMPING MACHINES OR THE LIKE FOR :HOLDING AND FEEDING STRIPS Filed April 14, 1943 3 Sheets-Sheet 3 yea- 5 lz v 2 zqll;

LII 45- INVENTOR M WW ATTORN EY Patented Feb. 13, 1945 ATTA (iHMENT TO STAMPING MACHINES OR THE LIKE FOR HOLDING AND FEEDING William'Feiler, West New York, N. J assignor to Arrow Manufacturing Company Incorporated, Hoboken, N. J., a corporation of New Jersey Application April 14, 1943; Serial No. 483,044

27 Claims.

I My present invention relates to attachments to a stamping machine or the like for controlling and positioning a'strip of material for the stamp- "ing performance.

I have illustrated my invention as embodied inor asassociated with a stamping apparatus of the'type wherein the stamping tool or die is moved down upon the work for the stamping operation, then upwardlyto its starting position 'to complete a cycle which cycle is repeated for each "successive stamping ioperation. This has been done for-convenience of disclosure; it being "understood that my invention can be usefully applied toothertypes of apparatus.

' One of the general objects of'my invention is an effective arrangement for positively looking 'a strip against movement.

"Another object of my invention is an arrange- 'ment comprising a pivoted pressure applying ment for use with a stamping mechanism or the like for locking a strip against any movement while it is being stamped and more particularly an improved arrangement wherebythe strip may be released for a feeding movement in timed relation to the stamping.

Another object of my invention is arrangement whereby a step by step feed of a 'strip' of material is efiected through an engagement with opening formed in the strip.

Another object of my invention is an improved j. attachment to a stamping mechanism or the -likewhe reby an opening left in the strip by a stamping operation is engaged to bring a new an improved increment of the strip into position for a further stamping operation.

Another object of my invention is an improved arrangement whereby a strip locking-means and -;a-strip feed means'are so coordinated and re- 'lated' that the strip locking means is rendered inoperative tolock the strip when the strip feedv ingmeansbecomes active to feed the strip.

Another object of my invention isan improved arrangement of a strip locking means, a strip feed means and an apparatus for performing its :operationupon the strip which are so coordinated gthatthe locking means are-inoperative only when the feeding means are operative and the stamp- .ing means. is out, of engagement with the strip. Among the more important provisions, for the attainment 'of-these objects are: n Means for locking a metal strip against movement comprising pointed pins of relatively hard material and means for applying them to a strip flof relatively softer'materialwith sufficient force ftecause them to pinprick the surface of the "strip; means for looking a strip against movemember and'a releasing trigger both mounted about a common pivot to gravitate thereabout in opposite directions;- spring pressure releasing means comprising a presse'r bar pivoted at one end and engaged at its otherend by a spring to apply pressure and a pivotally mounted trigger for releasing said spring pressure mounted by a movement about its pivot to cause it to swing said'presser bar about its pivot; an attachment to an apparatus having a cycle of'meve-v ment for the performance of an operation upon a stripof material, comprising pressure means for engaging and locking the strip against movement and means for relieving said pressure means automatically operated in timed relation to the operation of the apparatus; means for feeding a strip provided with openings therethrough comprising a camming finger and means for moving the finger into an opening in the strip in a direction transversely thereof to give the strip a camming feed; an arrangement for feedinga I strip having openings therein comprising a plurality" of fingers each having a camming surface thereon and'means for causing one finger to engage through an opening to give the strip 'an'in- 'crement of movement and for then causing the other finger to engage an adjacent opening to give it a further increment of movement; an arrangement for feeding a strip having openings therein v comprising. a fixed finger and a movable finger each provided with a camming surface and means for causing the pivoted finger to engage through an opening to givethe strip an increment of movement and for then causing the other finger toengage an adjacent opening to give the strip a further increment of movement and for then causing the pivoted finger to move into closer adjacency to the other finger; an attachment to a machine having a tool which cuts openings in 'the strip or material, said attachment comprising a fingermovable downwardly and in advance of the tool to engage an opening already formed -in the strip to give the strip an increment of movement to present a new length thereof to the tooland more particularly comprising a second finger to engage an adjacent opening after the first finger has moved the strip, to give the strip a further" movement.

For the-attainment of these objects and such other objects as mayhereinafter appearor be pointed out I have illustrated one embodiment of my invention in the drawings, wherein: n I

Figure 1 is a vertical section through the apparatus upon which the stamping operations have been performed;

Figure 2 is a top plan view of the strip shown in Figure l;

Figure 3 is a perspective view of the attachment for giving the strip a progressive step by step movement;

Figure 4 is'a top plan view of the strip holding attachment;

Figure 5 is a side elevational view of the holding attachment;

Figure 6 is a section taken onili-ne "6-5 of Figure 5 looking in the direction of the arrows and showing one position of the parts;

Figure 7 is a section similar to Figure 6 showing another position of the parts; :and

Figures 8 to 13 inclusive are views of the die stamping mechanism as it moves progressively from its top position of Figure 1 through a complate cycle back to that position.

:Before describing details of construction .of

the disclosed; embodiment I will premise that I engage the strip S and .to perform their .in-

tended operation thereon. The cycle of movement of the parts l5, l6 and VI! comprisesa progressive movement from the uppermost or start- I ing position donwardly toward strip .8 .until engagement is effected therewith for .a perform- ..ance thereon and then .a progressive return of these parts to their starting position. I will premise further that I have illustrated ,this stamping apparatus .as employing a plurality of tools 11 which operate successively upon an .areato form first the small openings S and .then the depressed flanges S and then the annular .elevation S and then to cut out the treated .area to leave the openings such as shown at I will here point ut that this is merely an exemplaryprocedure and is significant only as to .the last step wherein areas of the strip are removed to leave opening 5* by the operation of the :toolmember If! at .theextremeile'ft in Figure l and ==even here itis significant only as to one aspect of my invention.

My invention relates in .one of its aspects to a mechanism for holding the strip of material againstmovement for treatment of an area thereof-and more particularly. a manner of controlling that mechanism in timed relation to the functioning of the apparatus-whereby the strip is so treated and in the specific embodiment illusdies of a stamping apparatus; in another aspect 'it relates to 'a'mechanism for giving the strip with areas'removed which leave openings, a step by step feed effected through these openings to "bring new increments of *itsilength into the op erative position for successive operations by 'an apparatus and more particularly to the associa- -tion :of such mechanism with an apparatus which removes these areas and to-the .control .of the.

feeding mechanismin timed relation to the functioning of that apparatus; in still another .aspect itrelates to the timing of the control .of the strip holding-mechanism and the strip feeding mechanismso that the strip feeding mechanism func- 'tratedin timed relation to the movement of "the p tions during that period when the control of the strip holding mechanism releases the strip to permit it to be moved by the strip feeding mechanism and more particularly to the coordination of the timing of the two to each other with that of an apparatus such as is here disclosed.

I will-now describe a mechanism tin-accordance with my invention for holding the material in position for treatment by an apparatus of which .a stamping mechanism is an example by reference first to the Figures 1, 5 and 7 of the drawings wherein it will be observed that a casing or base member '40 .issecured to a base plate 4| in any preferred or desired manner as by members 42 which engage vertically through the lateral enlargements or flanges 43 of casing 40. This securement is illustrated in the drawings as effected by a threaded engagement of the members 42 with the casing and the base plate 4|.

"This securement may be effected in any desired way, it being merely the intention that the easing or holder 40 and the .base plate 4| .be assembled together as a unit to form an attachment to the apparatus illustrated in a preferred-practice of my invention as a stamping machine. This attachment is effected .by'securing the base plate .4! on the body I l of the stamping machine inany preferred or desired manner as for example by a screw or screws 44 (see Figure l).

The casing or holder 40is comprised of a .lower base portion 40' which isillustrated as relatively solid except as shortly to be indicated and the relatively narrower vU--shaped portion 40 extending upwardly therefrom as clearly shown in Figures 5 and 6. A plunger 45 of greater height or length than the height .of the base portion 40 is received vertically therethrough. This plunger 45 fits snugly within said opening but the fit is such that the plunger '45 is free .to gravitate and where vertically pos'itioned as in Figure 1 will gravitate downwardly as far as is permitted and in .Figure'l into engagement with strip S on the plate 4 l Carried from the opposite legs .of the U-shaped portion 40 pf the casingis a pivot pinor rod 41 upon whichis mounted between .saidlegs a presser bar 48 it being observed upon viewing the various figures that this presser bar is .carried about the pivot 41 adjacent one of its ends so that the other end will normally gravitate downwardly counterclockwise and the parts are so dimensioned and related that this normal counterclockwise gravitating movement will cause the lower surface 50 of this free end to engage with and rest upon the top of the plunger 45. To permit this engagement to be efiected without interference by the walls of the casing 40 which encompass the plunger 45, thisengaging surface 50 is curved vconvexly as shown morelclearly in Figures 1 and 6 and is limited in length and width to cause a manner of engagement which can be termed a wiping engagement thereof with the top surface plunger 45.

. A bar .or rod 52 is received .through'the ffreeor outer .end :of the presser bar48. This rod or bar 52 is shown as extending laterally beyond both ends of the casing 40 to clear it and to permit of the engagement with these ends of members 54 which apply a downward spring pressure to the rods 52 and therefore to the free ends of the presser bar 48. In the illustrated embodiment thesemembers 54 are shown as spiral springs en gaged at their upper end with the opposite ends of the bars and engaged at their lower ends with bar 48 and trigger 56 I will here point iif'Fig ure 2by the reference characterfs the base plate M in any preferred or desi'r'ed manner as'for example-that shown in Figure 5. 1 A trigger member 56 is also mounted for. swinging movement in the U-shaped portion 40" of the casing 40. In the illustrated embodiment this is shown'as effectedr'byspaced apart legs which depend from triggermember 56 and straddle the inner or pivoted end of the presser bar tlB.v I These legs pivoted "pin or rod 41 550- that'both the" presser 'are pivoted to swing about a'common axis. 1

' For an understanding of the manner in which the trigger 56 cooperates with th'espresser bar 48, attention is invited to the fact-that the trigger F member 56 has'its lower surface'defined in part by the inclined portion 58, and in part by the rel-- flare mounted to swing freelyaround'the" tion'i '13 .to leave a shoulder 14 therebetween. This leg 10 is contoured and positioned so as to cause the portions 12, 13 and 14 of the inner wall to function as follows: I

. The stamping apparatus is shown at its starting position at the top of its cycle. in Figu es 1 atively' horizontal portion 59 -which in the normal "positionof the partsshown in Figure 1, is parallel to and overlapslthe top surface of the preser bar48.1: The trigger member is pivoted. off its center' o'f gravity so that it will normally gravitate clockwise whereas as stated? the presser48 gravitat'e's counterclockwise. This action will bring these two? members to a normal" position andg-relation 1 .shownzin Figure l with the surfaces 59 and 49 inparallelism and in engagement and'thedimension and contours arepreferably designed to that end. 'x'However, the1trigger56 in the positionof theparts ofpFigurel can readily be swung counterclockwise about its pivot 41 until its top surfaceen'gages the top of the U=shap'e'd partll'l'xo'f the casing 40 'withouteffecting the position ofthe "presseribar. This positionis shown in dotted ,lines' in :Figure? 6. I The trigger '56ilcan 'als'o b'e swung..clockwise but in so: doing must swing-with -it=the presserI-bar 48 clockwise also which' requires a sufficient force toovercome: also thepre'ssure-fof .the'springsik far described; are the spring afl which-[apply }'a force manytimes greater. than any gravity f'orce .appliedhby the :presser bar "for the trigger '56 .so. .thatthe position of the partsofthe'mechanism vjust described is determined primarily'by this spring pressure to cause them to assume the position of Figure 1 where-theipresser bar applies the relatively large pressure of thesprings' to the plunger 45. to. force that plunger do'wn' into' en'- .gagementwith the work or'strip' Sas shown in r "The plunger 45 is shown as carrying two pins 6'] sharply pointed at theirlower'edge'which project belowth'e'bottom 'of plunger 45. These .pins are. preferably made of anextrernely hard and wear-resisting "material' and are" sharply vpointed. -The material of which the strip '8 is formed is relativelysoft ascompared to the hardness of the pin 51; Bras is an example. The "pressure appliedte these points bysprin'gs' 54-" is quite .large' and sufficient" to cause these pin indent and pin prick the strip at the; point 'eng'agernent'andI have indicated thesejpirr p the: reference will be. made tojthe' purpose. by' such fpin: pricking of, the material. j f

The trigger 5a is contoured, 'dii nensi'onedend located lso that its forward orright en'djin Figure 11 projects beyondcasingfll. Projectingfrom the lower end ofl.this projecting partis the trigger tooth .63 which. defined by. ,upper vsurface...

was, letiliely hori ntal and, the'l wer surv.

out w that the dominant force that determines the? position of the parts'thus and 8. In this position the bottom 15 of the leg.'H

is clear of and above the trigger tooth 63. When the toolcarrying member I5 is first moved downward'an initial distance, the bottomJ5 of the leg 1 l1" will. have reached. a point where it'contacts withthe top: s'urfa'ce'64'of' the tooth 63 which 'it overlaps; a continuation of its downward move- "merit'beyond that point of initial engagement will 'swin'g the trigger armilicl'ock'wise about its pivot support 41. untilthe position of Figure 9 is reached where the apex 66 of the'tooth'63 is about tocle'a'r the bottom 15 of the arm I I. Upon a continued downward moverhent from this point the'apex .66 ofthe tooth 63will snap past the inner edge of the bottom. :15 and engage the inner surface .portion'13 of the leg 1|. This'action will be understoodbycor'nparing the full line "and" dotted linepositi-on of the trigger "as shown in Figure 6 and the position of engagement of the toothapex with the surface portion'13 as shown in Figur 10.

This engagement will be maintained during the continued :downward movement of the leg H unti1 theapex 66 of tooth 63 clears the upper end of the surfaceportionjlii and the shoulder'l lat which time the trigger will resume its normal'position as shown 'in' Figure 11 and it can do this because the surface portion 12 i sumciently depressed relatively to the surface portion 13 to provide the" necessary clearance, It will be observedthat the position of Figure'll is reached when the tools 11. are adjacent the work and immediately' prior to that moment when they perform their stampingoperation. Figure 12 shows that moment'when the tools I! perform the stamping operation, with the trigger and its' assocated parts continued in their normal position *of Figure 11.

. Upon the return stroke, parts |5, l1, 10 and ll move upwardly first'from the position of Figure :12 without. any change in th position of the trigger finger 63 until the apex -66 of tooth 63 engages the shoulder 14 which causes it toswing counterclockwise which it is free to do without effecting the position of the presser bar 48 because of the character of the surfaces 58 and 59 and their I spatial relation to the pivot 41, until the top 'surface of. the tri ger. arm engages the top of the lJ-shaped portion '42- which isthe position'sliown infdotted lines in'Figure 6. This position-will'be maintained until the apex'66 of the 'tooth;63-ha's cleared. the:s'urfa'ce '13 which moving upwardly at. which moment the-tooth 63 will gravitate cloclwise to its full. line position shown in'Fig- 1- r From-this. description it will beob'served that the normal position of the parts just described is .that/shown'in Figure 1; that in'this normalposition the spring pressure is applied to the plunger Aland. through the plunger tothe points 6-! and portions 88, 89 and 88.

parts;

that this pressure is sufficient to cause these points to pin prick the strip so thatthenombina- :tion of all of theseconditions provides an engagement which will lock the strip firmly against movement for .the stamping operation; that this .1

locking engagementv effected by the spring pres? sure supplemented by engagement of the points of thepins "61 in the pin pricks S formed thereby, is effective at alltimes except during that limited portion .of the downward movement of the tools from its position shown in Figure :9 to its position shown in Figure 11 during which limited portion of the downward movement the spring pressure is released by the clockwise angling of trigger :63 by surface portion 13; and that during this limited period .of spring release, the points 81 engage in the pin pricks S only under the gravity pressure or weight of the plunger 45.

It. is during this limited period of release of spring pressure that the strip is given afeeding movement to bring a new length thereof into position for a stamping operation, in "the manner shortlyto be explained. Before doing so I-wish to .pointout that the weight of plunger 45 of itself imposes only a slight holding .action upon the strip suflicient to prevent accidental or free movement but not-suflicient to interfere with, its being fed along.

I will now describe an arrangement in accordance with my invention :for bringing a'new length thereof into cooperative relation to the particular apparatus with which it is associated or'to which it forms an attachment. This attachmentshown in Figure 3 removed from the apparatus comprises a head block 88 which may be of any desired shape or size and from which projects downwardly a fixed finger contouredand dimensioned as and for the purposes now tobe set forth. This finger is defined at its lower end by side surfaces 82' and 82 and by a bottom surface 82 which is inclined relative tothe end wall or surface 82' so that the finger terminates at its'lower end in the edge 83. a

The block 88 is slotted at 84 in the plane of the finger 8| and a second finger 85 is received :in this slot and is mounted at its upper end about the transverse pivot pin 86 to swing in the plane of the finger 8|. This swing is "permitted by the-fact that the finger 8| is dimensioned smaller than the head block 80 and positioned toone side thereof as will be seen from Figure 3. The

finger 85 has its lower portion defined on one side by end surface portions 86, 81 separated by ridge line 86, and on the other side by surface portion 88 so that the finger 85 terminates at its lower end in the edge 90. A spring .85 secured at one end to the finger 8|- in any preferred ordesired manner and at the other end to finger 85 normally tends to swing the finger counterclockwise about itspivot 86 in the-show- ;ing of Figure 3. This wing "is limited by the engagement of portion 92 of the finger 85 with'the end wall 82 of the finger 8| as clearly shown in Figure 1 which shows the normal position of the Before proceeding to describe the manner in As viewed in Figure 1 iratus :and in the-performance of the stamping operation I will make thesefurther observations: The spring 95 is relatively weak and has just enough pull to swing the finger 85. to its aforementioned engagement with the .finger 8| and therefore requires onlya slight force in the opposite direction to spread these fingers apart; the pointed end of the finger .85extendsa substantial distance below the pointed end of the finger '83 and therefore the inclined surface or face 82 of the finger 8|starts :at a higher level than does inclined face 82 which extends substantially above the ridge line 86 which defines the top end of inclined surface 86.

This attachment of Figure .3 is secured to the apparatus here illustrated for exempIification-in any preferred or desired manner. It is illustrated Reference has already been made to the cycle- .of movement of the tools in the performance of its operationin connection with the disclosure of a .mechanism for holding the strip against movement. I will describe the functioning .of the strip feeding mechanism by reference to this cycle.

Figures 11 and 8 show the stamping tools at the topof the cycle with the fingers 8| and 85 .elevated above the strip. During the aforementioned first increment of downward movement of the tool carrier to its position of Figure 9 itwill be observed that the lowermost end of the finger 85 will have entered that opening s which is .in vertical registration therebelow to engage its inclined surface 86 with the advanced wall of that opening and a continued downward movement of finger 85 will cause this inclinedface to cause the strip to the left in the drawings. Figure '9 shows a position where this camming action is partially performed and Figure 10 shows the position of the parts where the camming feed has been completed. A projection of this inclined face 86 on a horizontal plane will approximate the extent of such movement. The initial engagement of the inclined face of finger 85 will occur at that point in the cycle of movement of the parts when the trigger finger 63 has already been engaged by the bottom 75 of the leg 1| and swung clockwise to release and the trigger fingerwill be held in spring releasing position untilinclined surface .86 has passed below strip S tocomplete its camming action. This-is clearly shown in Figure .10.

Itis obvious that this camming action by the finger 85 will have been completed when the ridge 86' is in the plane of the strip. Figure 10 shows the finger moved slightly below this position. The finger 8| also moves-downwardly with the finger .85 but does not reach the plane of the strip until'just about the time that the aforetion of Figure 11,-the inclined surface 82 "will give the, strip a further inci'ementof movement to the left to complete-a cycle of feed. of the strip. These two increments of movement are effected While the pressure of the springs 54 continues being maintained in released or non-pressure apaction of the spring 95 holds the rear faceof thefinger 85 in engagement with the rear wall oflthe opening. This is the position of. the parts whenthe stamping operation is being performed as showntin Figure 12; Upon the retrograde or upward movement of the tool and the fingers 8| and :85,.finger 8|. merely moves upwardly out of the opening. but. the finger 85 is cammed to the left against the pressure of the spring -95because of the character Lot-the surfaces 90,89 and 88. This-camming or s'preadingaction of the finger 85cito the left isshown in Figure 13 and continues untilthe point 90.of that finger has cleared the stripat which momen't the spring 85 will immediately throw finger 85 counterclockwise about its p'ivot' tol'its original startingposition shown in Fi'gure 8, the parts being so dimensioned and contrived that in thisposition the lower end 90 of the finger 85 will now: be in vertical registra- -tionwith -the aforementioned adjacent opening s'i withfwhich the finger-8| has cooperated for the performance during the next cycle.

It"will-here be pointed out that at the moment when :the tools are actually engaging the strip to perform their stamping "operation the strip is engagedand locked in position not only by the p tints 61' at the right but also bythe engagement effected betweerrthe twofingrs-BI and 85. s

Havir'ig'thus' describedmy invention and'ilstrated its use. what-I claim" as new and desire -to ecure y Letters Patent, is v A device forengagingastripof material to hold it against"movement ,on' its base or support, 's'aid'device'comprising a'member, a pointed projection carried by and depending beyondqthe lower end of said membeig means for supporting -'s'alid;:men rber for free} downward movement v to --en gage 'said pointed end'with a strip therebe- 'iieath normally operativefl means for applying a 'iently' relativelylarge pressure to said mem- "to cause' saidpoint to prick pinch saifdl strip "and to remain engaged-in 's'aid' prick pinch to "lock saidstrip againstany movement and means for releasing said large. pressure" so, that the strip can be givenjia. movement merely by a force "sufficient to'; overcome the holding Ie'fiect or the jw'eight of-said member;

2 Ajdeviceifor engagin'ga strip of m'aterialto hold ,it' against movementlon its base or support, a'ididev'ice comprising'a member, normallyppa lito'gengag a strip therebeneath with a relatively small-pressure to hold it imposition, a presserg barpivoted; at: one: end, and means for causing thejother end :to :engage said member.

, and apply "theretoia relatively large pressure and means for releasing saidrlativelylajrge pressure comprisingitaxtrigger.engageable with the 'presser -bar2t'o disengage itironrsammember: i

hold it against movement on a base or support, said device comprising a member, a supporting casing mounted thereon to gravitate freely into engagement with a strip held therebelow, a

pointed projection depending from said member and means for pressing said member downwardly with sufiicient force to cause the point of said projectionto prick .pinch the strip to thereby effect a locking engagement. 4.,A device for engaging a strip of material to hold it against movement on its base or support,

.said device comprising a presser bar mounted about a pivot to gravitate normally in one direction and a trigger arm mounted about said pivot, to gravitate'normally in the other direction so. asrtofl causeits lower, surface to engage with the successive increments of length of a-strip of materialandcomprising means for moving-a'stamping tool from astartingpositioninto engagement with the strip vforia stamping operation and then back .toits starting position to. complete a cycle of operation, normally operative means for prick punching the strip and/thereby lockingthe strip againsbmovement, means for rendering said normally. operative means inoperative to lock the strip during that portion of saidcycle of tool movement when it. is out ofproximity to-the strip.'.

.6. Amechanism for giving a perforated strip anincrement of movement along its bed, said mechanism comprising a finger provided with a camming surface, means for moving said'finger into .a perforation of said strip to cause the camming surface to engage'with an edge of said opening, and to give said-strip an increment in itsownplane as the camming surface is moved mechanismcomprising a support, a-finger proecting from 'said support and provided with a camming surface; a second finger projecting from said support and also provided with a camming surface, means for moving said support to engage said first mentioned finger in aperforation and to give the strip-acamming feed in the plane thereof, and then engaging said secondzfinger in a perforation and giving the strip a second'camming feed to complete a feed of the strip. I :8. A mechamsm for giving a perforated strip an increment of movement along its wbed; said mechanism comprising a support, "a finger pro- 2 jecting from said'support and provided with a camming surface,' a second finger projecting from said" support and al soprovided with a camming surface, means for moving said support to engage said'first mentioned finger in a perforation and iving the strip a camming-feed in the plane thereof, and then engaging 'said second fingerin aperforation andgiving the'strip' a second camming feed to completea feed .of the strip, one of said fingers being pivoted. i

s 9. A mechanism for giving-a perforated strip an increment of movement along its bed; said me h Pfi l l l i if Support, a finger Jecting from saidsupport 3 and provided with a c mming surface, a second finger projecting from I Y M H H said support and-also provided with' a' camming .--?A"device for-engaginga-strip of materialto =siirfac'e,"mea'ns for-moving said supportto engage said first mentioned finger in a perforation and giving the strip a camming feed in the plane thereof, and then. engaging said second linger in a perforation and giving the strip a second camming feed to complete a feed o-f'the strip, and the other finger being fixed to the head.

10. A mechanism for giving aperforated strip an increment of movement along its bed, said mechanism comprising asupport, a finger provjecting from said support and provided with a camming surface,.a second finger projecting from said. support and also provided with a'camming surface, means for moving said support to engage saidfirst. mentioned finger in a perforation and giving thestrip a camming feed in the plane 4 thereof, and then engaging. said second finger in a perforation and giving, the strip a second camming feed to complete a feed of the strip, one of said fingers being pivoted and the other finger being fixed to the head, and a spring to normally move said pivoted finger into adjacency vto said fixed finger.

11. A mechanism for giving a perforated strip an increment of movement along its bed, said mechanism comprising a, support, a fingerprojecting fromosaid support and provided. with a camming surface,,a second finger projecting from said support and also provided with a camming surface,means for moving saidsupport to engage said first mentioned finger ina perforation and giving the strip a cammingfeed in the plane thereof, and then engaging said secondfingerin a second perforation and giving the strip a second camming feed to complete a cycle of feed 12. An apparatus for performing successive stamping operations uponsuccessive increments of length of a strip of material comprisingmeans for giving a stamping die a working stroke to bring it into stamping engagement with the strip for a stamping operation and thereafter a re.- turn stroke to move it out of such engagement and back to its starting position to complete a cycle of movement for a single stamping. operation and means operative only during that portion of said cycle ofmovement where the die is substantially clear of the strip to give the strip a incre mentof movement. to bring a new portion of the strip into position for the next stamping'ioperati'on, said last mentioned. means comprising, a camming finger mounted upon and moving with the die.

13. An apparatus for performing successive stamping operations upon successive increments of length of a strip of material; comprising means for giving a stamping die a workingstroke to bring it into stamping, engagement with'the strip for a stamping operation and thereafter a return stroke to move it out of such engagement and back to its starting position to complete a cycle of movement for a single Stamping operation and means operative only during thatportion of said cycle of movement where the die is substantially clear of the strip to give the strip an increment of movement to bring, a new portion of the strip into position for the next stamping operation,

said last mentionedlmeanscomprising a camv min-g surface fixedly mounted on and moving bring it into stamping; engagement with th strip for a stamping operation and. thereafter areturn,

stroke tomove itout of such engagement and back to its starting position to complete acycle of movement for a single stamping operation and means operative only during that portion of said cycle of movement Where the die is substantially clear of the strip to givethe strip an increment of movement to bring a new portion of the strip intoposition for the'next stamping operation, said last mentioned means comprisingtacamming surface fixedly mounted on and moving with. the die-and. a second camm'ing finger swingingly carried by the die, the fingers being so devised and arranged that they engage the strip in succession to give it two successive increments of. movement to complete a cycle of feed-with eachstamping cycle. i I

15. In combination with a stamping apparatus for performing successive stamping. out operations upon, a strip: of material to leave a succession of openings the strip alongits. length comprising means for giving astamping tool a working stroke for a stampin outzoperation and thereafter a. return stroke to completexa' cyclev of movement for a single stamping operation, of an attachment thereto for feeding the strip' to bring a new length thereof into position for a stamping out operation, said attachment comprising a finger movable with the tool to engage through an opening formed in the strip by the-stamping, operation during one cycle ofstamping operation to move the strip to present a new section thereof imposition for a stamping operation during the next cycle.

16. In combination with a, stamping apparatus for performing successivestamping out operationsupona strip of material to, leave a succession of openin s in the strip along its length and comprising means for giving a stamping tool a working stroke for a stamping out operation and thereafter a return stroke to complete a cycle of movement for a single stamping operation, of an attachment. thereto for feeding the strip to bring anew length thereof into position for a stamping, outv operation, said attachment comprising a plurality of fingers movable with the tool to engage in successionthrough an opening left by a previous stamping operation, to give successive increments of movement to the :strip to complete a cycle of feed to presenta new section of the strip in position for the next stamping operation.

1'7. In combination with a stamping apparatus for performing successive stamping out operations upon a strip of material to leave a succession of openings in the strip along its length and comprising means, for giving a stamping tool a working strokefor a stampin out operation and thereafter a return stroketo complete a cycle of movement fora single stamping operation, of an attachment thereto for feeding the strip to bring a new length thereof into position for a the strip a secondincrement of movement both increments of movement being given during a single cycle of operation of the stamping apparatus to complete the feed vof the strap for the next stamping operation.

18. In combination with ayzstampingxapparatus for performing successive;- stamping out o erations upon. a strip of material; to leave a sucaacaur cess'ionof openings in 'the strip along its'length and comprising means for givinga stamping tool aworking stroke for a stamping out operation and thereafter a return stroketo complete a cycle of movement for a single stamping operation, of an attachment thereto for feeding the strip to bring a new length thereof into position for a stamping out operation, said attachment com prising a finger to engage throughan' opening left by a previous stamping operation to give the strip an increment of movement and a second finger engageable through an opening left by a later previous stamping operation'togive the strip asecond increment of movement both increments of movement being given during a single cycle of operation of the stamping apparatus to complete the feed of the strip for the next'stamping operation.

19. In combination with a stamping apparatus for performing successive stamping out operations upon a strip of material to leave a succession of openings in' the strip along its length and comprising means for giving a stamping tool a working stroke for a stamping out operation and thereafter a return stroke to complete a cycle of movement for a single stamping operation, of an attachment thereto for feeding the strip to bring new length thereof "into position for astamping out operation, said attachment comprising a pivoted finger to engage through an opening left by a previous stamping operation to give the strip an increment of movement and a fixed finger engageable through an opening left by a later previous stamping operation to give the strip a second increment of movement, both increments of movement being given during a single cycle of operation of the stamping apparatus to complete the feed of the strip for the next stamping operation, and means for yieldingly holding the pivoted finger engaged'with the fixed finger.

20. An apparatus for performing successive stamping operations upon successive increments of length of a strip of material comprising means for giving a stamping die a working stroke to bring it into stampingengagement with the strip for a stamping operation and thereafter a return stroke to move it out of such'engagement and back to its starting position to complete a cycle of movement for a singlestamping operation and means operative only during that portion of said cycle of movement Where the die is substantially clear of the strip to give the strip an increment of movement to bring a new portion of the strip into position for the next stamping operation, said last mentioned means comprising a camming surface fixedly mounted on and moving with the die and a second camming finger-swingingly carried by the die, and sopositioned relatively to the die as. to engage the opening cut through the strip by the preceding stamping operation on the initial part of the working stroke of the tool to feed the strip for an increment of its length.

21. An attachment to be associated in fixed relation to a stamping machine or the like to engage a strip of material in position on the machine base and to hold it against movement during the stamping operation, said attachment adapted to be fixedly associated-to the base and comprising a member for continuously engaging the strip with a relatively small pressure which is sufficient only to hold the strip in position against accidental movement, normally active means for applying directly to said member a larger additional. pressure which is sufficient to cause the engagement of the member with the strip to lock the strip against any movement and means for renderingsaid normally active means inactive to release said larger pressure so that the strip can be given a feeding movement merely by a force sufiicient to overcome the aforementioned relatively small pressure of the continuous engagement of the strip by said member;

22. An attachment to a stamping machine or the like for engaging a strip of material to hold it against movement on its base or support, said attachment comprising a member, means for sup-.

porting-said member for free downward movementinto continuous engagement with a strip therebeneathto hold it in position against accidental movement, spring means for applying additionally a sufficiently relatively larger pressure to cause said member to engage the strip with a sufficiently larger force to lock the strip against any movement for and during a stamping operation Or the like, and means for releasing the spring pressure so that the strip canbe given a feeding movement merely by a force sufiicient to overcome the holding effect of the weight of said member.

23. An attachment to be associated in fixed relation to a stamping machine or the like to engage a strip of material in position on the machine base to hold the strip against movement during the stamping operation, said attachment comprising a member for normally engaging a I strip therebeneath with a relatively small pressure to hold it in position against-accidental movement, means for applying additionally a relatively larger pressure directly to said member which is sufficient to cause the member to lock said strip against any movement for and during a stamping operation or the like, said last mentioned means comprising a presser arm mounted to be moved into and out of engagement with said member, and normally active means for effecting such engagement and applying the relatively large pressure.

24. In combination with an apparatus for performing a stamping operation upon a strip of material and comprising means for moving a stamping die in its working stroke from a. starting position into engagement with the strip for a stamping operation and back to its stamping position to complete a cycle of movement, of means normally operative to lock the strip against movement, and means operative only during the last increment of said working stroke and only for a period that ends immediately prior to the engagement of the strip by the stamping operation, to release the strip to permit a feeding movement thereof.

25. In combination with an apparatus for performing a stamping operation upon a strip of material and comprising means for moving a stamping die in its working stroke from a starting position into engagement with the strip for a stamping operation and back to its stamping position -to complete a cycle of movement, of means normally operative to lock the strip against I movement, and means operative only during the last increment of said working stroke and only for a period that ends immediately prior to the engagement of the strip by the stamping operation, to release the strip to permit a feeding movement thereof, and means operative during said period of release to give the strip a feeding movement to bring a new length into position for stamping.

' 26. In combination with an apparatus for performing in, :stampin'g lope'ration *upon :a, strip m": material and comprising .means for timovln g Ya stamping die in its working -'stroke .from "a starting position into"engageme'zntwith .th'erstr1p:or'a. stamping operation and baekutoiits.staxiting'apoeition to complete a -cyc1e of =movement, of an attachment thereto comprising smeans which ana e'and"lockthe strip againstmovementzduring the entire cycle "of movement of the-'di'e excep'tior a period during its "working stroke which Zbeglhs after that stroke has *started and which ends before' the working :strok'eris completed 'byaengagement of the die'withthe istrip.

27. in combination "with aniapparaltus for performing at #stamping "operation :upon a. :strip o'f material :and comprising means .for moving 'i'a stamping die *in its working stroke :from za, startmgip itionrinto engagement withuthe strip'f'oraa stamping-.operationand backtto its .stantingwposit ion to complete -a. cycle of movement, of an attachment thereto which comprises means which engage and :lock the strip against movement and means for rendering :said I first =means inoperative to .=1ock:the :strip against :a feeding movement, said vsecond mentioned :means being rendered active .to render the first means inoper ative=as aforementioned by =the movement of the die however :only :during that ;peniod .of i its working Estnoke which begins after that :stroke has started and. whicbends before thejworkingstroke is completed by engagement of th die "with the @F-EILER. 

